package com.zbu.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.zbu.reggie.common.BaseContext;
import com.zbu.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/*过滤器
 * 检查用户是否完成登录*/
@Slf4j
@WebFilter(filterName = "LoginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    // 路径匹配器 进行路径比较的
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截的请求：{}", requestURI);
        //不需要处理的请求路径 ,直接放行
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",//移动端发送的短信
                "/user/login",//移动端登录
                "/favicon.ico",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };

        //2.判断本次请求是否处理
        boolean check = check(urls, requestURI);
        //3.如果不需要处理 直接放行
        if (check) {
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);//直接放行
            return;
        }
        //4.判断登录状态 如果登录直接放行
        if ((request.getSession().getAttribute("employee")) != null) {
            log.info("用户已登录，用户id:{}", request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request, response);//直接放行
            return;
        }

        //4.判断用户登录状态 如果登录直接放行
        if ((request.getSession().getAttribute("user")) != null) {
            log.info("用户已登录，用户id:{}", request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request, response);//直接放行
            return;
        }

        log.info("用户未登录");
        //5.未登录 返回未登录结果，通过输出流向客户端页面响应数据
        //R对象转JSON 然后 写回去
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    //检查本次是否需要放行
    public boolean check(String[] urls, String reqURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, reqURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
